And you got the update from Ford's website using your VIN?
https://help.ford.com/update-sync/usb/
Have you made any modifications to your screen and system?
At the bottom of the page I linked are links to contact Ford support by chat or phone if you have trouble with the update.
We have 2 Fords with Sync 3 that I've done updates on and once I figured out you have to sit there the whole 20-30 minutes with the car running, watching the screen for the appropriate time to press OK, there really isn't anything to doing the update if you follow the instructions exactly as written on that page.